Frances Tiafoe issued an apology after cursing out the umpire following his loss to Roman Safiullin in the Shanghai Masters. After shaking Safiullin's

U.S. Open semifinalist Frances Tiafoe has aimed a torrent of expletives at the chair umpire after losing a match at the Shanghai Masters.

U.S. Open semifinalist Frances Tiafoe cursed repeatedly at a chair umpire after losing a match at the Shanghai Masters on Tuesday. Tiafoe sent about 10 expletives in the direction of official Jimmy Pinoargote during a minute-long tirade after exiting 5-7,